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07-28-2022, 06:44 AM | #45 | |
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Let me know what else you find. I know how irritating it is chasing the boost issue. I've been chasing my leak for what seems like a year now. One thing you can check is your intake hose that leads to the filter. I helped a member troubleshoot his issue and it was that hose causing issues. Every time he WOT, the hose would collapse and cut out power. It felt like the car was NA. The whole system is mechanical so there's only a handful of reasons why there's boost issues. I have my boost tapped at the velocity stack and don't get constant readings. It's at 1 psi below 4K and once I go passed that is when my boost rises. Hopefully we both find a solution to our problem!
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08-01-2022, 08:43 AM | #46 | |
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08-21-2022, 03:47 PM | #47 |
Colonel
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Drives: 2011 E92 M3
Join Date: Oct 2017
Location: Victoria
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Little bit of an update:
I know for sure that there are no boost leaks. See photos. The boost drops at about 1 PSI every 2-3 seconds at 10PSI, not bubbles anywhere. I recently changed both belt tensioners, just to be sure. There was no evidence of belt slip but tensioners are cheap and easy to change. Boost line is now tapped to the plenum at the back as discussed. I do see boost peaks with my P3 of up to 9.5PSI. Still seems to act funny though. With the engine warm but the IATs still low, I still seem to get what feels like it starts to make boost, then it hiccups, then it starts to make some boost again. Sometimes it just feels stronger - and this is usually when I roll onto the throttle gently to WOT. If I hammer on it, that seems to be when the car struggles to make boost consistently. Perhaps I am just losing my mind... But sometimes it just feels right - other times it feels slow - and this is all before any heat soak kicks in with IATs under 40C. Anyway, now I know there is no boost leak and that there is no way the belts are slipping. BPMSport is the above indicative of a bypass valve issue? If it is, is there anything I can do (other than replace it)? Thanks again to all that have helped me through this wee bit of an issue. Cheers,
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